Public bug reported:

Right after resuming from sleep login process was interrupted and screen
briefly want black. Restored automatically.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-93.116-generic 4.4.79
Uname: Linux 4.4.0-93-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
BootLog:
 
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Sat Sep 16 20:22:35 2017
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) 
(prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company ZBook 15u G2 Mobile Workstation 
[103c:2216]
InstallationDate: Installed on 2016-04-30 (504 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
MachineType: Hewlett-Packard HP EliteBook 850 G2
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-93-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/10/2017
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: M71 Ver. 01.19
dmi.board.name: 2216
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 96.5B
dmi.chassis.asset.tag: 5CG5296NT6
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: 
dmi:bvnHewlett-Packard:bvrM71Ver.01.19:bd04/10/2017:svnHewlett-Packard:pnHPEliteBook850G2:pvrA3009F510303:rvnHewlett-Packard:rn2216:rvrKBCVersion96.5B:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 850 G2
dmi.product.version: A3009F510303
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.76-1~ubuntu16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.0.7-0ubuntu0.16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 17.0.7-0ubuntu0.16.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1.2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Fri Sep 15 19:49:06 2017
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                               13805 
 vendor                                     AUO
xserver.version: 2:1.18.4-0ubuntu0.3

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 ubuntu xenial

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https://bugs.launchpad.net/bugs/1717704

Title:
  [drm] GPU HANG: ecode 8:0:0xbe722ffe, in compiz [2256], reason: Ring
  hung, action: reset

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